This action is fired by the template files to begin the Builder core rendering process. The default action response is to run the BuilderLayoutEngine class' render method. This action is a good place to hook modifications to other rendering actions since it occurs before any actual content is rendered.

This is the first action called by the default builder_layout_engine_render function. The Builder core runs get_header and a function to output view and layout details for admin users off of this action.

Once the module has performed the width calculations based upon the container_width and content_width, an array of the widths (full_sidebar_width, sidebar_widths, and element_widt) is filtered by this filter.